
/*
 * Copyright 2011 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
#include "SampleCode.h"
#include "SkCanvas.h"
#include "SkGradientShader.h"

class GradientView : public SampleView
    {
    public:
        GradientView()
            {
            this->setBGColor(0xFFDDDDDD);
            }

    protected:
        struct GradData
            {
            int             fCount;
            const SkColor*  fColors;
            const SkScalar* fPos;
            };
        // overrides from SkEventSink
        virtual bool onQuery(SkEvent* evt)
            {
            if (SampleCode::TitleQ(*evt))
                {
                SampleCode::TitleR(evt, "Gradients");
                return true;
                }
            return this->INHERITED::onQuery(evt);
            }
        virtual void onDrawContent(SkCanvas* canvas)
            {
            SkPaint paint;
            paint.setAntiAlias(true);
            paint.setStyle(SkPaint::kStroke_Style);
            paint.setStrokeWidth(SkScalarHalf(SkIntToScalar(3)));
            paint.setStyle(SkPaint::kFill_Style);

            SkPoint p = SkPoint::Make(0,0);
            SkPoint q = SkPoint::Make(100,100);
            SkPoint pts[] = {p, q};

            SkScalar t, temp, x, y;
            SkColor gColors[] =
                {
                SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK
                };
            t =    SampleCode::GetAnimScalar(SkIntToScalar(2), SkIntToScalar(20));
            temp = SampleCode::GetAnimScalar(SkIntToScalar(1), SkIntToScalar(8));
            SkScalar step = SK_ScalarPI / (10);
            SkScalar angle = t * step;
            x =  SkScalarSinCos(angle, &y);
            SkScalar colorPositions[] = { 0, 0.1 + x, 0.4 + y, 0.9 - x + y, 1.0};
            GradData data = { 5, gColors, colorPositions };


            SkRect r = { 0, 0, SkIntToScalar(200), SkIntToScalar(200) };
            SkShader* shader1 = SkGradientShader::CreateLinear(
                                    pts, data.fColors, data.fPos,data.fCount,
                                    SkShader::kMirror_TileMode);
            paint.setShader(shader1)->unref();

            canvas->drawRect(r, paint);


            SkPoint s = SkPoint::Make(100,100);
            SkShader* shader2 = SkGradientShader::CreateRadial(
                                    s, 100, data.fColors, data.fPos, data.fCount,
                                    SkShader::kMirror_TileMode);
            paint.setShader(shader2)->unref();
            canvas->translate(250, 0);
            canvas->drawRect(r, paint);

            SkShader* shader3 = SkGradientShader::CreateTwoPointRadial(
                                    p, 0, q, 100, data.fColors, data.fPos, data.fCount,
                                    SkShader::kMirror_TileMode);
            paint.setShader(shader3)->unref();
            canvas->translate(0, 250);
            canvas->drawRect(r, paint);

            SkShader* shader4 = SkGradientShader::CreateSweep(
                                    100, 100, data.fColors, data.fPos, data.fCount);

            paint.setShader(shader4)->unref();
            canvas->translate(-250, 0);
            canvas->drawRect(r, paint);

            this->inval(NULL);
            }

    private:
        typedef SampleView INHERITED;
    };

//////////////////////////////////////////////////////////////////////////////

static SkView* MyFactory()
    {
    return new GradientView;
    }
static SkViewRegister reg(MyFactory);